1984] 
Holldobler & Engel-Siegel — Metapleural gland 203 
Fig. 1. The metapleural gland of Ana, illustrating the major anatomical feature 
of this organ, a. SEM micrograph of the mesosoma of A. cephalotes, showing the 
large pronounced vault (bulla) which covers the storage chamber. Arrow points to 
the slit-shaped opening (meatus), b. Longitudinal section through the mesosoma of 
A. se.xdens, showing the large , region of the metapleural gland (MPG). c. Longi- 
tudinal section through metapleural gland: CS = collecting sac; GC = glandular cells; 
M = meatus; R = storage chamber or receptacle. 
